Method of manufacturing articles of synthetic composition.



E. P. mcumsom METHOD Of MANUFACTURING ARTICLES 0F SVNTHETIC COMPOSITION.

Patented Jan. 9, 1917.

APPLICATION FILED AUG-23. ISIS.

WITNESSES jfl/md f 1n dished halves 3 by dies giving to it the UNITEDSTATES,

PATENT OFFICE.

EBERHARDT P. NIQHOLSON OF NEW YORK, N. Y.

Specification of Letter! Patent.

Patented Jan. o, 1916.

Application flled August 38, 1am. Berle. No. 118,420.

To all whom it may concern:

Be it known that I, Eananamrr, P. NICHOLSON, a citizen of the UnitedStates, and a resident of the city of New York, Richmond Hill,borough'of Queens, in the county of Queens and State of New York, havein vented a new and Improved Method of lllunufacturing Articles ofSynthetic Composition, of which the following is a full clear, and exactdescription.

lily invention relates to the manufacture of articles from a syntheticcomposition, and it has reference more particularly to the moldingofsame.

The object of the invention is to provide a simple and inexpensivemethod for manufacturing articles of synthetic composition.

In the manufactureof articles of synthetic composition it is necessaryto provide a core about which the syntheticcomposition is to be formedwithin a mold. In View of the irregularity of such articles, as, forexample, doll heads, bodies,.etc., the core must be made of a number ofparts to be extracted through an opening narrower than the cross sectionof the hollow of the article. This huihlinp, up and extracting of thecores re-. quires considerable time and increases the price of thearticle, in view of the labor expen'fled thereupon.

The object of my invention is to eliminate the use of collapsible orsectional cores and substitute therefor a hollow core about which thesynthetic material is molded within a mold and which core remains partof the molded article.

To illustrate the method, drawings are appended in which- Figure 1 is alongitudinal section through an article molded in accordance with mymethod; and Fig. 2 is a cross section through the article on linc 22,Fig. 1.

' Cores of the above character may be mal1- ufactured of any suitablematerial, papierniche, for example. The core is pressed shape of thearticle which is to be molded mold 6, shown in dotted lines in Fi 1 and2, thereby providing a uniform t ickness within the mold about the core.

The halves hyglue, or an other suitable cement, which is introducedetween the meeting edges of the halves. This binding makes a unit out ofthe core halves. The unit is then dipped into a scmi-plastic solutionthe consistency of which is such that itadheres easily to the surface ofthe core and forms a comparatively thick film on the surface of the coredipped therein. The core covered with the film of synthetic compositionis then placed into the mold and pressure is applied to compress thefilm on the surface of the core and also to render the foul-mes of thearticle sharp. The projections 5 on the surface oi the core, in additionto properly spacim the core within the mold; also presents n ,1; in forthe film of the synthetic com )osition on the surface of the core.

T 1o pressure applied to the mold to mold he article about in corecauses corniression of the routing on the corn and lightly that of thecore within the molded article. The tendency for rcstitution'mainainsthe core firmly against the coating molded about the core. The hollowcore which forms part of the article does not add material weight to thefinished article, but it does materially increase the resistance of thearticle and its unbreakable qualities.

The price of the hollow cores which form the base of the articles iscomparatively minim, for they can be made of very cheap material. Thereis no extra labor, after the cores have been mude, for placing and extrncting the same from the articles molded therenbout. The coresexpedite the moldin considerably and facilitate the retention 0% thesynthetic composition on the surface of the molded article, for thereason that'the material used may be of a character having a rough.surface to which the synthetic composition will adhere easily.

It is self-evident that the halves of the core do not have to be totallyclosed esofthe core are bound together so about the core. The halves ofthe corcare prevented from. relative dis lacement by mbbetin'g themeeting ed as so that they inter-engage. Other wellrncwn means can shownin the drawings, but where it impos dsible it is preferable, for theresistance ofif f the article is considerahlyjncreasod end its be emploed for the samepurpose. The unbreakable qualities increased therewith.outer sur ace of the core has a number oi In cases where doll heads orbodies are moldt,

rojections 5 rovided at suitable intervals ed, thee-ore will be open atthe; places where 55 mm one cool: 16!- These projections main-i thearticle is to be 0 en. Another advantage tain the core in properposition within a ot forming the mol s of halvesls that there is nonecessit of o perfect match between the halves. B ight variation betweenthe halves will in no way affect the article which is to be moldedthereon, this being taken care of by the mold which shapes the syntheticcomposition about the core, and, as has been pointed out, the core beinhollow it will give under the pressure app ied to the mold.

I claim: l

1. A method of manufacturing "articles of synthetic composition, whichconsists in forming a hollow core the surface of which presentsprotuberanccs for centering the core in a mold and for providing a gripfor a coating, dipping the core into a solution oi synthetic composltionof a oonsistenc sufiicient to form a thick film on the sur. ace of thecore, and lucin the core with the coating into a mo (1 ant subjectingthe mold to pressure.

2. A method of manufacturing articles of synthetic co position, whichconsists in forming a ho low core of halves with protubercnccs on-theouter surface of the core, cementing the halves, dipping thecementedhalves into a solution of synthetic composition of a consistencysuiiicient to form a thick coating on the surface of the core, placingthe core with the coating thereon into the mold, then subjecting themold to pressure, the protuberonces on the core centering the same inthe mold and controlling theluniforlnity of the coating on thecore.

l ElilCRI'lAltD'l l. NICHOLSON.

